Furnace



S. DANIELS July 11, 1933.

FURNACE Original Filed Jan; 19, 1929 4 Sheets-Sheet l 0 r a 0 y NN o m m MA oww I J S s go u ...H RN hm W waawmv j .om wmhm mm Mm wa wm 7 f1 WWI LT! 1 Th WL [H w m S. DANIELS July 11, 1933.

FURNACE OI iginal Filed Jan. 19, 1929 4 Sheets-Sheet 2 W! Hill! Sam el 12am z'el,

Emily M, 11933..

S. DANIELS FURNACE Original Filed Jan. 19. 1929 4 Sheets-Sheet 3 rllll.

49 ATTORNEYS juiy M, 1933. s. DANIELS 1,917,702

FURNAC E Original Filed Jan. 19, 1929 4 Sheets-Sheet 4 0F HIHIHHHIIIHIHHIHIHIIHIIImnlnnullmmm @115, as hm ""ilm E %M W W WWW mm Patented July 11, 1933 UNITED STATES SAMUEL DANIELS, OF HARDWICK, VERMONT FURNACE Original application filed January 19, 1929; Serial No. 333,587. Divided and this application filed April 23,

This application is a division of my copending application filed January 19, 1929, Serial No. 333,587, for Furnaces.

The present invention relates to improvements in furnaces and more particularly it relates to hot air heating plants.

An object of the invention is to produce a furnace fire-pot and combustion chamber construction designed for maximum efficiency in the utilization of the full heating value of the hot gases constituting th products of combustion.

A further object is the provision of a novel construction of fire-pot combined combustion chamber and comprising means for holding the fire brick in place and including iron castings forming the bottom of the fire-pot.

Another object is the provision of a combined arrangement of combustion chamber and fire-pot, and ash-pit units in which the fire-pot unit is detaehably secured to the ashpit top in a novel manner and the whole furnace unit is adapted to be readily moved within a sectional furnace casing.

A still further object is to provide an arrangement and construction of smoke outlet pipe which may be readily assembled and taken down and which is of novel and efficient design.

Another object is the provision of a fur nace construction of efficient and simple design comprising combustion chamber fire-pot and ash-pit the parts of which. are'designed in such a way that they may be readily assembled and detached.

Other objects will appear hereinafter.

The invention consists in the features, combination, and arrangement of parts hereinafter described and particularly pointed out in the claims.

In the drawings:

Figure 1 is a front view of the furnace embodying my invention and including combined combustion chamber and fire pot and ash-pit.

Fig. 2 is a vertical section substantially on line 2-2 of Fig. 1. i

Fig. 3 is a vertical cross section substantially on the line 33 of Fig. 2, looking toward the rear.

Serial No. 446,772.

Fig. 1 is a horizontal section substantially on line H of Fig. 1.

Fig. 5 is a section substantially on line ti- 5 of Fig. 2.

Fig. 6 is a section substantially on line 66 of Fig.

Fig. is an elevation of the ash-pit and grate assembly, the wall of the ash-pit casing being partly broken away.

F ig. S is a top plan View of the ash-pit frame assembly.

Fig. 9 is a bottom plan View of the ash-pit frame and front.

Fig. 10 is a detail sectional view on line 101O of Fig. 8, showing the manner of assembling the frame.

11 is a rear view of the ash-pit front.

Fig. 12 is a top plan view of the fire-box frame.

Fig. 13 is a bottom plan View of the firebox frame.

Fig. 14 is a sectional View on line 14--14 of Fig. 12.

Fig. 15 shows the hook bolt connecting the frame to the fire-box.

*Fig. 16 is a bottom plan view of the back and side castings for the top of the fire bricks.

Fig. 17 is a sectional View through the fire-box wall and casting showing the means of securing the casting to the Wall.

Fig. 18 is a sectional View through the fire-box wall and casting. i

Fig. 19 is a side elevation of the front portion of the fuel feed tube and plates associated therewith.

Fig. 20 is a front view of the same, the plates being removed.

Fig. 21 is a rear view of the feed door and lining.

Fig.

22 is a rear view of the feed tube. Fig. 23 is a view of the feed tube collar. The furnace unit comprises the combined combustion chamber and fire-pot 27 and the ash-pit 20 supporting the combined combustion chamber and fire-pot and extending forwardly beyond the same to space the same from the sectional front wall of the furnace casing, not shown. The ash-pit 20 co1nprises a sheet metal box with the ash-pit front 3 mounted at its front end, and ash-pit frame 16 resting on top of the box and bolted to the ash-pit front 3 by means of hook bolts 16a hooked through flange 16b of ash-pit frame 16. The ash-pit frame is also detachably bolted to the walls of the ash-pit by means of hook bolts 88 hooked through openings in the walls. Hook bolts 89 also dctachably connect the ash-pit front with the ash-pit walls, as shown in Fig. Secured to the ash-pit front 3 is ash-pit door hinge 4, ash-pit door catch 5, shaker lug 6, having slot 61: therein for loosely receiving the lower end of shaker handle 19, and ashpit door 2 having draft door 1 thereon operated by chains or the like from above to regulate the air under the grate bars for combustion.

Shaker bar 23 is pivotally secured to the shaker handle 19 and extends rearwardly through the front 3 into the ash-pit. The shaker handle 19 is provided with a shaker bar stop 15, pivotally secured thereto and adapted to be swung to lie on top of the shaker bar, or will tip over to allow the shaker bar to slide in and out to rock the grate bars. The stop 15, when tipped to lie on top of the shaker bar, provides the correct space between the shaker handle and the ash-pit front to set the grate bars in level position.

The grate bars are mounted to rock in the frame 16 which comprises grate bar rests 22 bolted to the top of the ash-pit. The grate bar rests have studs 22a to rockably receive the grate bars, at one end of each of which is the lever arm 30 carrying a stud 30a for engaging a corresponding aperture 23a in the shaker bar. The lever 30 is provided with a hole 305 to receive a stud 22a and the opposite end of the grate bar is provided with a U-shaped, notch to rest on the opposite stud 22a. The studs 30a of lever arms 30 of the various grate bars, of which three are shown (but any desired number, as three, four, or five grate bars may be used with furnaces the depths of which are correspondingly varied), engage the spaced apertures 23a in the shaker bar to be rocked thereby. The rcarmost stud 30a is provided with an upstanding lug 300 to prevent the shaker bar from becoming detached therefrom in use, the corresponding aperture 230 in the shaker bar being large enough to permit passage of the stud 30a with its lug 300 when the shaker bar is lifted slightly relative to the grate bar.

The combined combustion chamber and fire-pot unit is bolted to the fire-pot frame 18 and is supported thereon. Frames 16 and 18 are bolted together through lugs 70. The feed tube 7 extends forwardly from the combined combustion chamber and fire-pot and spaces the same from the front wall of the casing, not shown. The feed tube has a flange 71 thereon engaging the outside of the front wall 26 of the combined combustion chamber and fire-pot at the feed opening and a collar 13 on the inside of the wall 26 bolts through the flange 71 and holds it to the fire-pot.

The feed tube front comprises a feed door hinge member 11 secured to the right side of the open mouth of the feed pouch, a feed door catch member 12 secured to the left side of the feed tube mouth, upper and lower sheet iron flanges 38 and 28 connecting 11 and 12, and a door 8 provided with a cold air draft 9.

The door 8 is provided with a feed door lining comprising a plate 10 having a rearwardly extending flattened hot blast tube 10a subject to the heat in the fire-pot to preheat the cold air entering through draft door 5) operated through eye 9a by chains from above.

At the inside end of the feed pouch is a feed pouch apron 14 to hold the front bricks E in place. This apron is bolted to the bottom of the feed tube and has a depending inner flange 14a overlying and protecting the top ends of the fire bricks. The bottom wall of the feed tube is depressed at to provide a shoulder 81 engaged by the front end of the apron 14, so that the upper faces of said bottom wall and apron are substantially flush and provide an even feed surface.

Bricks F, larger and longer than the front bricks E, are disposed at the sides and back of the fire-pot. All of the bricks are supported upon the fire-pot frame 18. Casing 35 is disposed at the rear wall of the fire-pot and has a depending flange 35a to overlie and hold the bricks in place. Similar castings 36 at the sides of the fire-pot protect and hold the side bricks in place.

The fire-pot frame 18 provides inner and outer upstanding flanges 82 and 83 around its edge forming a groove 84. to receive the lower edges of four walls of the combined combus- 3 tion chamber and fire-pot unit. The frame 18 is fastened to the front and rear walls of the firebox by means of book bolts 85 hooked through holes 88 in the fire-box wall, providing a readily detachable construction. The inner edge of the frame 18 is provided with an upstanding retaining flange 86 which serves to hold the brick in place. A groove 87 is formed between the flanges 86 and 83 to receive the lower ends of the firebrick and preferably the bricks are cut away at these flanges so that their front faces will be flush with the inner edge of the frame 18 and their rear faces will lie against the back wall of the combined combustion chamber and fire pot.

The castings 35 and 36 have inclined surfaces topermit free upward passage of the hot gases and to prevent eddy currents, and are provided with depressed portions 356 and 86b for the passage of bolts, as shown in Figs. 16 and 17, to secure the castings to the walls.

In the smoke opening in therear wall 25 of the combined combustion chamber and firepot is mounted a smoke collar 32 having a flange 32a engaging the outside of the rear wall. The smoke collar projects inwardly of the wall 25 and receives on its inner end a smoke collar ring 33 bolted to the inner face of the wall 25 and an elbow 34 attached to the inner end of the smoke collar by means of pins. The elbow 34 is preferably made in two parts bolted together and is disposed with its open end up to receivethe smoke accumulating in the curved dome 27a of the combustion chamber. This construct-ion ensures combustion being completed within the furnace and ensures the utilization of all heat in the hot gases. On the outer end of the smoke collar is secured smoke collar extension 37 which preferably hooks on the collar with hook bolts and extends through the back wall 55 of the casing (not shown) to connect to the usual smoke pipe. The smoke collar and extension may be made in one piece.

My furnace is designed to provide standard parts so far as the width of the furnace is concerned and to provide for changing the depth of the furnace from front to rear without altering the width of the furnace.

Thus furnaces having two, three, four, or five grates may be provided, having different depths from front to rear, but the width of the parts remaining standard.

The feed door assembly on the furnace, the front end of the combined combustion chamber and fire-pot, the back end, the smoke collar assembly, and the ash-pit assembly front and back ends, are the same in all sizes of furnaces.

To make the next size of furnace, it is only necessary to provide a corresponding length of grate rest 22, bottom side of fire-pot frame 16, castings 36 to go on top of side firebricks, a fire-pot cover 27 providing sides and curved top, an extra grate and two extra firebricks, one on each side. The other parts of the furnace are standard. Everything pertaining to the width of the furnace back and front ends is standard.

The furnace unit comprising the detachable combined unit and ash-pit is adapted to be readily moved within a sectional hot air furnace casing having front panels with grooved edges adapted to removably engage the edges presented by the ash-pit front and the edges presented by the front of the firepot feed tube, including upper and lower flange members 38 and 28 and side members 11 and 12.

Such a casing is disclosed in my application 333,587 hereinbefore referred to.

I claim:

1. In combination in a furnace including a combined combustion chamber and fire pot unit having upwardly extending side walls,

a frame at the bottom of the combined unit providing a support for the unit and fire brick, said frame having inner and outer upstanding flanges and an intermediate flange forming an outer groove receiving the lower edges of the walls of said unit, and an inner groove receiving the lower ends of a fire brick lining to hold the brick in place, horizontally disposed castings secured to the side and rear walls having downwardly disposed terminal flanges to overlie and hold the top of the fire brick in place, and a feed tube on the front wall having an apron extending inwardly with a depending terminal flange for holding and protecting the fire brick beneath the apron on the front side.

2. In combination in a furnace including a combined combustion chamber and fire pot unit, said combined unit having a feed tube depressed near its inner end and providing an intermediate shoulder, an apron bolted to said depressed portion and having its edge engaging said shoulder with its upper face substantially flush with the upper face of the feed tube to provide an even feed surface, and an inwardly extending portion with a depending terminal flange for holding and protecting firebricks disposed therebeneath, horizontally disposed castings having downwardly disposed terminal flanges secured to the side and rear walls to overlie and hold the fire bricks in place, said castings lying in a plane above the feed tube apron, and a frame at the bottom of the combined unit providmg a support for the fire brick.

.In testimony whereof, I affix my signature.

SAMUEL DANIELS. 

